2 * Copyright (c) 2007-2012 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include <linux/if_arp.h>
22 #include <linux/if_bridge.h>
23 #include <linux/if_vlan.h>
24 #include <linux/kernel.h>
25 #include <linux/llc.h>
26 #include <linux/rtnetlink.h>
27 #include <linux/skbuff.h>
28 #include <linux/openvswitch.h>
29 #include <linux/export.h>
31 #include <net/ip_tunnels.h>
32 #include <net/rtnetlink.h>
36 #include "vport-internal_dev.h"
37 #include "vport-netdev.h"
39 static struct vport_ops ovs_netdev_vport_ops;
41 /* Must be called with rcu_read_lock. */
42 static void netdev_port_receive(struct sk_buff *skb)
46 vport = ovs_netdev_get_vport(skb->dev);
50 if (unlikely(skb_warn_if_lro(skb)))
53 /* Make our own copy of the packet. Otherwise we will mangle the
54 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
56 skb = skb_share_check(skb, GFP_ATOMIC);
60 skb_push(skb, ETH_HLEN);
61 ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
62 ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
68 /* Called with rcu_read_lock and bottom-halves disabled. */
69 static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
71 struct sk_buff *skb = *pskb;
73 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
74 return RX_HANDLER_PASS;
76 netdev_port_receive(skb);
77 return RX_HANDLER_CONSUMED;
80 static struct net_device *get_dpdev(const struct datapath *dp)
84 local = ovs_vport_ovsl(dp, OVSP_LOCAL);
89 struct vport *ovs_netdev_link(struct vport *vport, const char *name)
93 vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
96 goto error_free_vport;
99 if (vport->dev->flags & IFF_LOOPBACK ||
100 vport->dev->type != ARPHRD_ETHER ||
101 ovs_is_internal_dev(vport->dev)) {
107 err = netdev_master_upper_dev_link(vport->dev,
108 get_dpdev(vport->dp));
112 err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
115 goto error_master_upper_dev_unlink;
117 dev_disable_lro(vport->dev);
118 dev_set_promiscuity(vport->dev, 1);
119 vport->dev->priv_flags |= IFF_OVS_DATAPATH;
124 error_master_upper_dev_unlink:
125 netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
131 ovs_vport_free(vport);
134 EXPORT_SYMBOL_GPL(ovs_netdev_link);
136 static struct vport *netdev_create(const struct vport_parms *parms)
140 vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
144 return ovs_netdev_link(vport, parms->name);
147 static void vport_netdev_free(struct rcu_head *rcu)
149 struct vport *vport = container_of(rcu, struct vport, rcu);
153 ovs_vport_free(vport);
156 void ovs_netdev_detach_dev(struct vport *vport)
159 vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
160 netdev_rx_handler_unregister(vport->dev);
161 netdev_upper_dev_unlink(vport->dev,
162 netdev_master_upper_dev_get(vport->dev));
163 dev_set_promiscuity(vport->dev, -1);
165 EXPORT_SYMBOL_GPL(ovs_netdev_detach_dev);
167 static void netdev_destroy(struct vport *vport)
170 if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
171 ovs_netdev_detach_dev(vport);
174 call_rcu(&vport->rcu, vport_netdev_free);
177 void ovs_netdev_tunnel_destroy(struct vport *vport)
180 if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
181 ovs_netdev_detach_dev(vport);
183 /* Early release so we can unregister the device */
185 rtnl_delete_link(vport->dev);
189 call_rcu(&vport->rcu, vport_netdev_free);
191 EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
193 static unsigned int packet_length(const struct sk_buff *skb)
195 unsigned int length = skb->len - ETH_HLEN;
197 if (skb->protocol == htons(ETH_P_8021Q))
203 void ovs_netdev_send(struct vport *vport, struct sk_buff *skb)
205 int mtu = vport->dev->mtu;
207 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
208 net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
210 packet_length(skb), mtu);
211 vport->dev->stats.tx_errors++;
215 skb->dev = vport->dev;
222 EXPORT_SYMBOL_GPL(ovs_netdev_send);
224 /* Returns null if this device is not attached to a datapath. */
225 struct vport *ovs_netdev_get_vport(struct net_device *dev)
227 if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
228 return (struct vport *)
229 rcu_dereference_rtnl(dev->rx_handler_data);
234 static struct vport_ops ovs_netdev_vport_ops = {
235 .type = OVS_VPORT_TYPE_NETDEV,
236 .create = netdev_create,
237 .destroy = netdev_destroy,
238 .send = ovs_netdev_send,
241 int __init ovs_netdev_init(void)
243 return ovs_vport_ops_register(&ovs_netdev_vport_ops);
246 void ovs_netdev_exit(void)
248 ovs_vport_ops_unregister(&ovs_netdev_vport_ops);